One thing I don't like about this new engine, is the idea of using 0-30w oil. It will result in slightly less friction and better mileage, but I would think the better mileage would come at the cost of engine life because the thinner oil can't provide the same "cushion" of protection that a thicker oil would. This isn't based on first hand knowledge or experience, but makes sense to me. Thicker oils are also approved and I think that's what I'll use when I get one of these some day. Anyone know more about this?

That viscosity of oil sounds way too thin to me - unless you reside in Alaska.

I've been driving diesel trucks (at work - not my own vehicle) for almost twenty years now, and every one of them has called for "15w-40" motor oil. They run so darn hot that it seems to me that the thin stuff would not be ideal for a compression-ignition engine. Then again, perhaps technology has moved forward a bit. Follow what it says in the owner's guide for the type/weight of motor oil, and then change it (and the oil filter) far more frequently than what they tell you.

FYI: I drove a 2008 Kenworth T-300 today (a rental truck) with a Paccar/Cummins 8.3L turbodiesel and it called for 15w-40 oil, as per a decal on the coolant reservoir. Nice truck!

The last number in the weight is the equivalent weight, so it is 30 weight. The "0" is for cold pour. Lighter weight oils remove heat faster than heavier oils. Do what the book says,,,,,,,,,,,,,,,,,,,,,,

0-30w oil is ONLY used for ever increasing EPA restrictions due to "pollution" and NOT because that's what the motor needs. I would use a thicker oil. Especially if you are towing and live in a warmer climate. Ford is doing this to almost all of their vehicles.

0-30w oil is ONLY used for ever increasing EPA restrictions due to "pollution" and NOT because that's what the motor needs. I would use a thicker oil. Especially if you are towing and live in a warmer climate. Ford is doing this to almost all of their vehicles.

Not so much. The new oils are better lubricants and they transfer heat better. Thick oil is old school........................

One thing I don't like about this new engine, is the idea of using 0-30w oil. It will result in slightly less friction and better mileage, but I would think the better mileage would come at the cost of engine life because the thinner oil can't provide the same "cushion" of protection that a thicker oil would. This isn't based on first hand knowledge or experience, but makes sense to me. Thicker oils are also approved and I think that's what I'll use when I get one of these some day. Anyone know more about this?

Not sure where you heard this as I just read the manual on the 6.7 and it said either 10-30 or 15-40..

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